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ZLED-PCB1 PDF预览

ZLED-PCB1

更新时间: 2024-11-27 01:16:11
品牌 Logo 应用领域
艾迪悌 - IDT /
页数 文件大小 规格书
22页 900K
描述
40V LED Driver with Temperature Compensation

ZLED-PCB1 数据手册

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ZLED7010  
40V LED Driver with  
Datasheet  
Temperature Compensation  
Brief Description  
Features  
Capable of 95% efficiency*  
The ZLED7010, one of our ZLED Family of LED control  
ICs, is an inductive step-down converter that is optimal  
for driving a single LED or multiple LEDs (connected in  
series) from a voltage source greater than the voltage  
rating of the LED. The ZLED7010 operates in continu-  
ous mode. Capable of operating efficiently with voltage  
supplies ranging from 6 VDC to 40 VDC, it is ideal for  
low-voltage lighting applications. The ZLED7010 mini-  
mizes current consumption by remaining in a low-current  
standby mode (output is off) until a voltage of 0.3V is  
applied to the ADJI pin.  
Operates in continuous mode with a wide input  
range from 6 VDC to 40 VDC  
Integrated 40V power switch  
One-pin on/off or brightness control via DC voltage  
or PWM control signal  
Switching frequency: 1MHz  
Dimming rate: 1200:1 (typical)  
Output current accuracy: 5% (typical)  
Built-in temperature compensation and open-circuit  
protection for LEDs  
In operating mode, the ZLED7010 can source LEDs with  
an output current of 750mA (30 watts of output  
power*) that is externally adjustable. The ZLED7010’s  
integrated output switch and high-side current sensing  
circuit use an external resistor to adjust the average out-  
put current. LED control is achieved via an external con-  
trol signal at the ZLED7010’s ADJI pin, implemented as  
a pulse-width modulation (PWM) waveform for a gated  
output current or a DC voltage for continuous current.  
Thermal shutdown protection for the ZLED7010  
Very few external components needed for operation  
Broad range of applications: outputs up to 750mA  
SOP-8 package  
The ZLED7010 provides a temperature compen-  
sation function for maintaining stable and reliable  
LED operation. LED over-temperature conditions  
are detected via a negative temperature coefficient  
(NTC) thermistor mounted close to the LEDs. If an  
over-temperature condition occurs, the NTC value  
reaches the value of a threshold resistor and the  
IC reduces LED current automatically. After the  
circuit recovers to a safe temperature, current  
returns to the set value.  
Application Examples  
Illuminated LED signs and other displays  
LED traffic and street lighting (low-voltage)  
Architectural LED lighting, including low-voltage  
applications for buildings  
Halogen replacement LEDs (low-voltage)  
LED flood-lighting  
LED backlighting  
General purpose exterior and interior LED lighting,  
including applications requiring low-voltage  
ADJO outputs and ADJI inputs of consecutive ICs  
can be interconnected as a driver chain deploying  
the temperature compensation information of the  
predecessor. This reduces the part count because  
only the first stage of the series requires an NTC.  
General purpose low-voltage industrial applications  
ZLED7010 Application Circuit  
6 to 40 VDC  
RS  
VS  
D1  
1
2
n LED  
R3  
C1  
1μF  
NTC  
VIN  
RNTC  
ISENSE  
4
3
6
L1  
ZLED7010  
8
5
RTH  
ADJI  
LX  
47μH  
C2  
100nF  
R2  
ADJO  
GND  
7
50k  
Ω
* See section 2.3 and 1.4 for details  
© 2016 Integrated Device Technology, Inc.  
1
April 20, 2016  
 

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